Improvement in the stop-motion for railway drawing-heads



NITED STATES' PATENT FFICn.

HENRY TARDE, OF HOPKINTON, RHODE ISLAND.

IMPROVEMENT IN THE STOP-MOTION FOR RAILWAY DRAWING-HEADS.

Specification forming part of Letters Patent No. 39,845, dated September 8, 1863.

To @ZZ whom it may concern:

Be it known that I, HENRY TABOR, of Hopkintou, in the county of Washington, in the State of Rhode Island, have invented a certain new and useful improvement in stop-mo tions for what are known as railway drawingheads77 in cotton-mills 5 and I do hereby declare that the following is a full and exact description of the same, which has been prepared. with the view to the obtaining of Letters Patent therefor.

The accompanying drawings represent my improvement, with so much of the mechanism of the railway drawing-head as is essential to understand it. Y

The drawings form a portion of this specification.

Figure l is a side elevation, and Fig. 2 a plan view.

Similar letters indicate like parts in both figures.

The purpose of my invention is to release a belt-shipper and allow it to ship the drivingbelt upon a loose pulley, and thus stop the machine whenever the roving is either too large or too small. The belt-shipper is of an ordinary kind, and its operation, by the action of a spring or gravity or other convenient force, is of the ordinary character. My invention relates entirely to the means of detachin g or releasing the belt-shipper.

My belt-shipper is subject to the action of any required degree of force, but it is retained by such an arrangement of catches that a slight motion of a very delicate apparatus may release it. The same apparatus serves to detach the belt-shipper if the roving is too small as serves the same purpose if the roving is too large, but the part or member of the apparatus through which the motion is received in the two cases is different, as will be fully shown below. l

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation by the aid of the drawings, and of the letters of reference denoted thereon, and b is a loose pulley thereon.

A is the framing of the machine.

B is the main driving-shaft and fixed pnl. ley thereon, and b is a loose pulley thereon.

C is a belt, capable of running on either pulley.

D is a shipper, adapted to shift or ship the belt from one pulley to the other, and E is a lever, pivoted at e', and connected to the shipper D, as represented.

F is a coiled spring, which tends to operate the shipper toward the loose pulley,and so to stop` the machine. The upper end of E is provided with a spring-catch, e, adapted to weighted in the usual manner, so that it will press with proper' force uponA the roving M, which is carried through between it and H. These rolls are geared together as usual, and all the parts yetY described are constructed and operated so as to perform their several functions in the usual manner.

I I are brackets, bolted upon A at the points represented, and supporting the small shaft J, so that it is free to partially turn or rock therein. A suitable corner or projection is produced on J, 'adapted to hold the catch. e until the shaft J is turned partially, and then to release it. Two short arms, J and J2, are also formed on J, as represented. The arm J is attached to a coiled spring, K. The other arm, J2, is at right angles to J', but at some distance therefrom on the shaft J, as shown.

L is a horizontal lever, pivoted at l to the frame A, and free to turn to a slight extent.

Its short arm carriesapost, L', as represented. Y

Its longer arm is adapted to cover and hold down the arm J2 of the shaft J. An elastic lever, N, pivoted at n to the framing A, bears with one arm against the lever L, as represented. Its other arm is connected to the coiled spring K, as shown. The tendency of the coiled spring K to contract performs a double function or effect by tending to turn the shaft J so as to release e, and also tend ing to turn the lever L to keep it upon the arm J2, unless it is overcomeV by some force. By the hands of the attendant, the parts are adjusted in the positions shown in Fig. 2 be` fore the machine is started, and so long as the size of the roving is correct, no action other than the constant revolution of the proper rollers, Ste., occursybut on the passage of a large or small portion of rovir g Xhrough the machine,the post L is drawnto the right, and stops the machine. The means of drawing this post toward the right-hand side of the tgures differ if the roving is small from those which act if it is large, but both are constantly attached and ready to act, and may be very readily understood.

O is a thin strap or plate of metal, standing with one end between the rolls G and H, and with its other end embracing the top of the post L', as represented. The part between the rolls is so thin that it is relieved from any considerable pressure of the top roll by the presence of the roving between the top and the bottom roll, so long as the roving maintains its full size, it being understood that the plate O stands near the roving, but a little one side thereof. So long as the roving maintains its proper size in its passage through, as represented by M, the top roll, G, is sustained thereby at a sufficient elevation above the pl tte O to just avoid touching it, or to avoid acting on it with much force; but the instant a smaller roving than is proper is delivered or enters the delivering-rollsthe top roll, G, sinks a little and presses upon O, and the friction of the roll G upon the upper face, and of the roll H upon the under face,both pulling` upon the post L, operates the lever L, releases the shaft J and lever E, and the belt is shipped and the drawing-head stopped until the attendant can have time properly to rectify the evil and again adjust the parts and start the machine. This is the action when the roving becomes too small.

A little distance from the delivering-rolls G ll, and on the side from which the roving M is received, is an upright lever pivoted at p, and carrying at its top a trumpet, P, adapted, as represented, to gather the roving into a cylindrical or nearly cylindrical form as it passes through it before entering the delivering-rolls. On one side of this is an eye, as represented, and on one side of the post Ll is a projection or hook, as represented. A slight connection or link, Q, connects the trumpet or bugle- P with the post L by the aid of the eye and hook described. So long as the roving is ofthe ordinary and proper size, or smaller, the part P stands erect, and the roving passesthrough with ease, but the moment it becomes too large for easy passage through the bugle P, it causes the latter to turn on its center p and pull on the link Q and post L. This pull on the latter operates the lever L, and produces the same result as already described, the difference being` simply that in the case last supposed the roving was too large, and the operating force is derived through P and Q, While in the case before supposed the roving was too small and the force was derived through the plate O. The spring R tends to hold the bugle P in a position in which it does not pull on the post L', and the link Q is so hooked upon the post that it will play thereon and allow the post L to be pulled by the plate O without the bugl l being-mov( d. The tension of the spring lt, which in such case alone sustains the bugle P against the friction of the roving which is being drawn through it, is very gentle, and is ready to yield on any considerable increase ofsuch friction. The tension of this spring, as also of the spring K, may be made adjustable by any convenient` means, if desired.

The operation of my invention, as already implied, is as follows: When the post L is pulled by either the plate O or the link Q, it causes the lever L to turn on its center l and disengage its opposite or long arm from the arm J 2., The liberation vof this arm allows the allows the parts to yield to the strains with facility, and prevents their becoming so soon deranged.

A bugle identical with my bugle P (and similarly arranged, excepting the connection to the post L) has long been used ou railway drawing-heads to serve as a regulator of the action of the drawing-rolls. In such former use of this device its motion back and forward, under the iniiuences of the friction of the roving and the sustaining force of the spring, served,by connections and mech anism,(not represented,) to move a belt (not represented) on cone-pulleys (not represented.) I connect similarly in my machine, in addition to the parts herein shown and described; and the link Q is in my invention adapted `to allow a sufficient motion of P to effect the aforesaid old and well-known function without necessarily operating the stop-motion-that is to say, my machine is so arranged that when the roving is a little too large the bugle P will move a little way toward the rolls GH, and will, by such slight motion, set in operation the mech` anism which is adapted to produce an increase in the extent to which the roving is drawn or reduced, and will thus reduce gradually the the size ot' the roving without stopping the machine 5 but if the roving becomes very much too large, the bugle P will. then be moved farther toward G H than before, and will then not only set in operation the reducing mechanism, but will also operate the stop-motion, as described. The one function of P does not interfere with the other function.

Having now fully described my improvement, what l claim as new therein, and desire to secure by Letters Patent, is

l. The employment in railway drawingheads of the plate O, or its equivalent, standing between the rolls and so connected and arranged that a diminution in the size of the railway drawing-head, of' the lever N and spring K, so that the latter shall perform the double function of holding the lever L and turning the shaft J, as herein set forth.

Witnesses N. L. RICHMOND, B. TUCKER.

HENRY TABOR. 

